2.5's are everywhere the 1.9 is also an izuzu motor. the 2.0 is believe is the chevette motor that was only in s seriers trucks from 82 to 84. the 2.0 was replaced with 2.5 in 85 and the 1.9 izuzu and 2.2 izuzu motor went away in 85 also. after 86 it was only the 2.5 but they are very common.